If you're a "new vaper", you might be drawing too hard on your particular device. This isn't quite like smoking a cigarette. A longer, gentler draw works best. Drawing or puffing too hard pulls in more e-liquid to the coil than it can vaporize. The excess has nowhere to go, floods the coil, and goes into your drip tip or mouth.
A drastic change in temperature/air pressure can disrupt the negative pressure in a tank. Going from a cool environment (air conditioning) to a hot environment (outdoors), or vice versa, can cause a tank to leak or the coil to flood.
Before flying on a pressurized jet, or traveling up into the mountains, empty your tanks. Drastic changes in elevation can also cause a tank to leak.